Toxicokinetic modeling of octylphenol bioconcentration in Chlorella vulgaris and its trophic transfer to Daphnia magna

Ecotoxicology and Environmental Safety
Jerry Collince AcharJinho Jung

Abstract

Bioconcentration of 4-tert-Octylphenol (OP) in freshwater algae Chlorella vulgaris was investigated by considering the effects of algal growth and exudate excretion. The OP uptake in algae was approximately 113 mg kg-1 after 24 h, and the uptake rate constant was estimated as 2.4 × 104 L kg-1 d-1. The OP sorption onto exudates reduced OP bioavailability to C. vulgaris to 11% after 24 h, with a sorption coefficient of 9.7 × 103 L kg-1. The elimination of OP by algae growth (0.80 d-1) was dominant over real elimination (0.60 d-1). The calculated bioconcentration factor of OP in C. vulgaris following uptake and elimination rate constants was 4.0 × 104 L kg-1. Further, bioaccumulation of OP in Daphnia magna was investigated by considering both aqueous and dietary (C. vulgaris) exposures. Uptake and elimination rates of OP via water were 1.6 × 104 L kg-1 d-1 and 0.95 d-1, respectively, while ingestion rate and assimilation efficiency via diet were 0.41 d-1 and 58%, respectively. The OP accumulation in D. magna predominantly occurred via water (63%) relative to diet (37%), resulting in a bioaccumulation factor of 2.7 × 104 L kg-1. The estimated trophic transfer factor was 0.25, suggesting that OP biomagnification was unlikely in the ...Continue Reading

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Citations

Aug 25, 2021·The Science of the Total Environment·Jinyoung SongJinho Jung

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